*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.container{
    width: 780px;
    margin: auto;
}
.container::after{
    content:"";
    display: table;
    clear: both;
}
header {
    background: #6bc2ef;
    margin-bottom: 50px;
}
nav{
    padding-top: 11px;
    padding-bottom:11px;
}
.nav-left,.nav-center,.nav-right{
    float: left;
    width: 33.333333%;
}
.nav-left {
    height:56px;
}
.nav-center{
    text-align: center;
}
.nav-right{
    text-align: right;
}
.nav-right a{
    color: #fff;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
}
nav .nav-right a img {
    display: none;
}
.banner .col{
    width: 50%;
    float: left;
}
.banner{
    color: #fff;

}
.banner p{
    font-weight: bold;
}
.banner h1{
    font-weight: 500;
    margin-bottom: 25px;
    font-size: 33px;
}
.banner a{
    background-color: #2996cc;
    padding:15px 53px;
    font-weight: bold;
    text-decoration: none;
    color: #fff;
    font-size: 12px;
    display: inline-block;
    border-radius: 2px;
    transition: 0.5s;
}
.banner a:hover{
    background-color:#1882b7;

}
.banner img{
    width: 100%;
    display: block;
}
main{
    margin-bottom: 60px;
}
main .col{
    width: 25%;
    float: left;
    text-align: center;
    /*padding-left: 10px;*/
    /*padding-right: 10px;*/
}
main img{
    margin-bottom: 10px;
}
main h3{
    font-size:14px;
    margin-bottom: 10px;
}
main p{
    font-size: 14px;
    color: #657082;
}
.download{
    border-top: 1px solid #e0e0e0;
    text-align: center;
    margin-top: 65px;
    margin-bottom: 65px;
    padding-top: 65px;
}
.download h2{
    margin-bottom: 20px;
}
.download p{
    margin-bottom: 35px;
}
.download a{
    display: inline-block;
}
.download img{
    margin-bottom: 0;
}
footer{
    background-color: #1b2126;
    color: #6a777d;
    padding-top: 60px;
    padding-bottom: 60px;
}
@media (max-width: 600px) {
    .container { 
        width: 80%;
    }
    .nav-right span{
        display: none;
    }
    nav .nav-right a img {
        display:inline-block;
        margin-right: 30px;
        
    }
    .banner .col{
        width: 100%;
        text-align: center;
    }
    .banner a{
        margin-bottom: 30px;
    }
    .banner img {
        width: 80%;
    }
    main .col{
        width: 100%;
    }
}